The nocturnal geckos evolved from diurnal species, which had lost the eye rods. Carphodactylidae ", "Direct evidence of phospholipids in gecko footprints and spatula-substrate contact interface detected using surface-sensitive spectroscopy", "On the origin of frictional adhesion in geckos: small morphological changes lead to a major biomechanical transition in the genus, "High Quality Bioreplication of Intricate Nanostructures from a Fragile Gecko Skin Surface with Bactericidal Properties", "Mechanism of Tooth Replacement in Leopard Geckos – Developmental Biology Interactive", "Identification of putative dental epithelial stem cells in a lizard with life-long tooth replacement", "Phylogenetic relationships among gekkotan lizards inferred from c-mos nuclear DNA sequences and a new classification of the Gekkota", "Evidence for Gondwanan vicariance in an ancient clade of gecko lizards", "Coming to America: Multiple Origins of New World Geckos", "Restriction site-associated DNA sequencing (RAD-seq) reveals an extraordinary number of transitions among gecko sex-determining systems", "Repeated origin and loss of adhesive toepads in geckos", Global gecko association site with pictures, caresheets, species list, Artificial gecko feet for a Spiderman suit (BBC 2007-08-28), https://en.wikipedia.org/w/index.php?title=Gecko&oldid=983679648, Articles to be expanded from February 2020, Creative Commons Attribution-ShareAlike License, This page was last edited on 15 October 2020, at 16:33. The smallest gecko, the Jaragua sphaero, is a mere 1.6 cm (about half an inch) long and was discovered in 2001 on a small island off the coast of Hispaniola. It has also been introduced to the southern USA (Louisiana, Alabama, Texas, Arizona, Florida, Arkansas, Mississippi, South Carolina, Georgia, Oklahoma, Virginia, Maryland, California, Nevada, New Mexico, Kansas, Tennessee). Rostrum four-sided, not twice as broad as deep, with medial cleft above; nostril pierced between the rostrum, the first labial, and three nasals; 7 to 10 upper and 6 to 8 lower labials; mental large, triangular, at least twice as long as the adjacent labials, its point between two large chin-shields, which may be in contact behind it; a smaller chin shield on each side of the larger pair.
Racerunner (Cnemidophorus [Aspidoscelis] sexlineatus), Coal
 Next to the full grown tooth there is a small replacement tooth developing from the odontogenic stem cell in the dental lamina. Digits variable in length, the inner always well developed; 6 to 8 lamellae under the inner digits, 8 to 10 under the fourth finger, and 9 to 11 under the fourth toe. Such pads have been gained and lost repeatedly over the course of gecko evolution. Most geckos in the family Gekkonidae use chirping or clicking sounds in their social interactions, tokay geckos (Gekko gecko) are known for their loud mating calls, and some other species are capable of making hissing noises when alarmed or threatened. Body and limbs moderate. In countries where the species has been introduced, they are not considered invasive due to their habits and small size; they rarely threaten populations of native animals. These protuberances are very small, up to 4 microns in length, and tapering to a point. This formation is common in all species in the order Squamata. They emit a distinctive, high-pitched call somewhat like a squeak or the chirp of a bird, possibly expressing a territorial message.  The formation of the teeth is pleurodont; they are fused (ankylosed) by their sides to the inner surface of the jaw bones.
 These lipids lubricate the setae and allow the gecko to detach its foot before the next step. Geckos are unique among lizards for their vocalizations, which differs from species to species. This gecko was 60 cm (24 in) long and it was likely endemic to New Zealand, where it lived in native forests.  Each spatula is 0.2 μm long (one five-millionth of a meter), or just below the wavelength of visible light..  While most gecko species are nocturnal, some species are diurnal and active during the day, which has evolved multiple times independently. , Gecko toes seem to be "double jointed", but this is a misnomer and is properly called digital hyperextension.  Gecko toes can hyperextend in the opposite direction from human fingers and toes.
, Like most lizards, geckos can lose their tails in defense, a process called autotomy. , All geckos shed their skin at fairly regular intervals, with species differing in timing and method. When shedding begins, the gecko speeds the process by detaching the loose skin from its body and eating it.
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